Electric sheet-metal cutter



Dec. 6, 1921. 1,651,823 T. J. KELLEHER ELECTRIC SHEET METAL CUTTER Filed May 3. 1926 @nz/flnp (IKE/Zeke)? Mafi Q; T

so end of said base and adapts Patented Dec. 6, 1927.

mom Kansans. rumors.

- ELECTRIC sneer-timid] s-tam Application filed May a,

This invention'relates to an electric sheet metal cutter adapted to cut sin le sheets of sheet metal and usable for all t e purposes for which tinners shears are used. I I a Amongthe objects of the invention are to obtain an electric cutter which will rapidly out flat sheets of metal, of varyin thicknesses, and which may be made to ollow a line orpattern marked or laid upon the sheet which is being out. An additional object of I the invention is to obtain an electric sheet metal cutter which may be integral with or attachable to the shell of an electric drill 'of well known types, without change in the 1.; construction of said. drill or of the shell thereof. A further object is to obtain a cutter of the kind named which'is simple in construction, economically made, durable, and not liable to become broken or to get out of order. I

In the drawing referred to Fig. 1 is a side elevation of an electric drill and of a'con struction embodying thisinvention attached thereto. a I Fig. 2 is a top plan view on an enlarged scale, of said construction.

Fig. 3 is a vertical section on line 3-3 of Fi 1, viewed as indicated by arrows; and Fig. 4 is a side elevation of'a portion of a pivoted lever forming an element of the construction illustrated in the remaining figures. Y

A reference character applied to designate a given part indicates sai part throughout the several figures of the drawing wherever the same appears. a 1

1. represents the shell of an electnc' drill; 2 represents the switchlever by means of which the energizing of the motor of the drill is controlled. 3 represents the flexible electric conductors to the drill. 4 represents a cylindrical member of the shell of t e drill. 5 represents an ordinary drill chuck. 6 represents a shaft which is secured in chuck 5 in. the ordinary way of securing drills in said chuck. 7 represents a disk which is rigidly mounted on shaft 6. 8 represents a sheet metal base and 9, 9, curved members which are illustrated as inte a1 with one (i to form eleof which the mentsof a clamp by means I construction is attachable to member 4 of the shell 1. '10 illustrates the element of the clamp which is complementary to members 9, 9. 11 represent screws or bolts by means of which the clamp is rigidly attached to 1am. I ga ses; 106,391.

said

is rigidly'attached to base 8, as by screws, bolts-orrivets 13. 14 represents a member winch is rigidly mounted on base 8, as by screws, bolts or rivets 15'. 16 represents a cutter which is 'movably mounted in member- 14. When the device is in operation the cutter-16 is rapidly moved longitudinally in member14, and I prefer to make member 14 offhard bronze metal and cutter 16 is made of a hardste'el or alloy. 17 represents member 4. "12 represents a cutter which i a lever which is pivotally mounted, or fulcrumed on'bolt 18; said bolt preferably extendingthrou'gh aperture 19, (Fig. 4) and into member 14. Said bolt 18 also preferably extends into a corresponding screw threaded aperture in base 8. .The end of lever 17' which is attached to cutter. 16 is provided with aperture 20, (Fig. 4) and 21 represents a bolt which'extends through said aperture and into the cutter 16. This aperture 20 is slightly elongated to permit the lever 17 to turn on bolt 18, while moving cutter 16 longitudinally in member 14. 22 represents a member having a universal connection which is; mounted at one end by a ball joint to crank 23, and at the other end. also by a ball' -joint, 24, to lever 17 The crank 23 is mount-v ed on'disk 7. The ball joint 24forming one part of connection 22 is'mount'ed or joinedto the remainder of said connection by pivot 25, Fig. 1. The ball joint at the ends of connection 22 are illustrated as respectivelvi comprising a' removable member, as 26, 27, Fig. 2, which are'secured'in place by screws or rivets 28, 29. 30 represents a sheet of. i

metal in position to be cut by the device embodying this invention, and 31, Fig. 1. indicates by broken lines a portion of said sheet of metal which has been cut, showing how the shellof the drill, 1. is movable over said sheet of metal while the same is being or has been cut. 7. i

I To operate the device it is simply necessary to move itand the drill over a sheet of metal-which is to be out so that the line on which the cut is to be made is between the cutters 12 and 16, energize the drill by switch lever 2 and move the. drill and cutter alongthe sheet so that the line thereon which is to be cut is continuously between said cutters.

The ra id movement of cutter 16 will cut the sheet of metal along said line.

I claim:

1. An electrically operated cutter provided with a shell, a chuck, and a base rigidly joined to said shell, in combination with a shaft attached. to the chuck of said drill, a ,crank,.mounted on said shaft, a lever fulcrumed on said base, a connecting member 5 provided with ball joints at each end thereofbetween said crank and said lever, acutter rigidly mounted von said base and an additional cutter movably mounted on said base to coact with said rigidly mounted cutter;

l0 and a connection between said 'movably mounted cutter and said lever.

An electrically operated cutter provided with a shelLand-wvith a chuck rotataed on said shaft, a lever fulcrumed on said.

base, a member having a universal connection between said crank and said lever, a cutter rigidly mounted on said base and an additional cutter movably mounted on said base to co-act with said rigidly mounted cutter,

and a connection between said movably mounted cutter and said lever.

THOMAS J. KELLEHER. 

